| .R86 | Eugene Roshal | Ficheiros Compactados | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R87 | Eugene Roshal | Ficheiros Compactados | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .R88 | Eugene Roshal | Ficheiros Compactados | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .RAR | Rocky Sand Studio | Ficheiros Compactados | WinRAR Compressed Archive | 7-Zip | Igor Pavlov |
| .RAT | World Wide Web Consortium (W3C) | Ficheiros Compactados | PICS Rating File | Microsoft Notepad | Microsoft Corporation |
| .REV | Eugene Roshal | Ficheiros Compactados | RAR Recovery Volume Set | WinRAR | Eugene Roshal |
| .REZ | Monolith Productions | Ficheiros Compactados | Lithtech Game Engine Resource File | Dragon UnPACKer | Open Source |
| .RK | M Software | Ficheiros Compactados | WinRK File Archive | WinRK | M Software |
| .RNC | RNC (Rob Northen Computing) | Ficheiros Compactados | RNC ProPack Archive File | RNC ProPack | RNC (Rob Northen Computing) |
| .ROA | Gravic, Inc. | Ficheiros Compactados | Remark Office OMR Archive | Remark Office OMR | Gravic, Inc. |
| .RP9 | Cloanto Corporation | Ficheiros Compactados | RetroPlatform Disk Image Archive | Amiga Forever | Cloanto Corporation |
| .RPM | Red Hat | Ficheiros Compactados | Red Hat Package Manager File | Red Hat Package Manager | Open Source |
| .RSS | Various Developers | Ficheiros Compactados | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RTE | Autodesk, Inc. | Ficheiros Compactados | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RXX | Eugene Roshal | Ficheiros Compactados | RAR Compressed Files From A Multi-Volume Archive | 7-Zip | Igor Pavlov |
| .RZ | Andrew Tridgell | Ficheiros Compactados | Rzip Compressed Archive | rzip | Andrew Tridgell |
| .S00 | Lithops Software | Ficheiros Compactados | ZipSplitter Part 1 Archive | ZipSplitter | Lithops Software |
| .S01 | Lithops Software | Ficheiros Compactados | ZipSplitter Part 2 Archive | Lithops Software ZipSplitter | Lithops Software |
| .S02 | Lithops Software | Ficheiros Compactados | ZipSplitter Part 3 Archive | Lithops Software ZipSplitter | Lithops Software |
| .S07 | Eugene Roshal | Ficheiros Compactados | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .S09 | Eugene Roshal | Ficheiros Compactados | Split Multi-volume RAR Compressed File | WinZip | Corel |
| .S7Z | Igor Pavlov | Ficheiros Compactados | 7-Zip Compressed File | 7-Zip | Igor Pavlov |
| .SAR | Commodore International | Ficheiros Compactados | Saracen Paint Image | XnView MP | XnSoft |
| .SAZ | Microsoft Corporation | Ficheiros Compactados | Fiddler Session Archive ZIP Data | Fiddler | Microsoft Corporation |
| .SBC | Microsoft Corporation | Ficheiros Compactados | Office Accounting Company Shortcut File | Microsoft Office Accounting | Microsoft Corporation |
| .SBX | Dream Design Entertainment Software | Ficheiros Compactados | GLBasic Shoebox File | GLBasic | Dream Design Entertainment Software |
| .SCZ | OpenLimit SignCubes AG | Ficheiros Compactados | OpenLimit SignCubes Zip Container File | OpenLimit CC Sign | OpenLimit SignCubes AG |
| .SDA | Oracle Corporation | Ficheiros Compactados | StarOffice Drawing | Apache OpenOffice | Apache Software Foundation |
| .SDC | Stardock Corporation | Ficheiros Compactados | Stardock Central Download Archive | Stardock Central | Stardock Corporation |
| .SDK | Autodesk, Inc. | Ficheiros Compactados | AutoSketch Drawing | AutoSketch | Autodesk, Inc. |
| .SDN | Robert K. Jung | Ficheiros Compactados | Shareware Distributors Network File | ARJ Software JAR | Robert K. Jung |
| .SEA | Smith Micro Software | Ficheiros Compactados | Self-Extracting Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SEN | Neyer Software LLC | Ficheiros Compactados | SenTest Data File | Neyer Software SenTest | Neyer Software LLC |
| .SEZ | Geoslope | Ficheiros Compactados | SEEP/W ZIP Compressed Data | SEEP/W | Geoslope |
| .SFARK | Unknown Developer | Ficheiros Compactados | Melody Machine Compressed SoundFont File | Awave Studio | FMJ-Software |
| .SFS | Open Source | Ficheiros Compactados | Squashfs File Archive | 7-Zip | Igor Pavlov |
| .SFX | Corel | Ficheiros Compactados | Windows Self-Extracting Archive | WinZip | Corel |
| .SH | Unknown Developer | Ficheiros Compactados | Bash Shell Script | Notepad++ | Don Ho |
| .SHA | Corel | Ficheiros Compactados | CorelDraw Shader File | CorelDRAW Graphics Suite | Corel |
| .SHAR | Unknown Developer | Ficheiros Compactados | Unix Shar Archive | shar | Unknown Developer |
| .SHK | Andy Nicholas | Ficheiros Compactados | ShrinkIt Compressed Apple II File Archive | ShrinkIt | Andy Nicholas |
| .SHR | Open Source | Ficheiros Compactados | Unix Shell Archive File | unshar | Open Source |
| .SIN | Big Huge Games | Ficheiros Compactados | Rise Of Nations Campaign Media File | Rise Of Nations | Big Huge Games |
| .SIT | Smith Micro Software | Ficheiros Compactados | StuffIt Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SITX | Smith Micro Software | Ficheiros Compactados | StuffIt X Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SLE | Sisulizer | Ficheiros Compactados | Sisulizer Package File | Sisulizer | Sisulizer |
| .SLP | Magix Software GmbH | Ficheiros Compactados | SpectraLayers Pro Project | SpectraLayers Pro | Magix Software GmbH |
| .SNAP | Erik Kunze | Ficheiros Compactados | ZX Spectrum Emulator Mirage Microdrive Snapshot | XZX-Pro | Erik Kunze |
| .SNB | Samsung Electronics | Ficheiros Compactados | S Note File (Old Version) | S Note | Samsung Electronics |
| .SOLITAIRETHEME8 | Eugene Roshal | Ficheiros Compactados | LoversLab Renamed RAR Archive | WinRAR | Eugene Roshal |
| .SP1 | Microsoft Corporation | Ficheiros Compactados | Microsoft Windows XP With Service Pack 1 Installation Data | Microsoft Windows | Microsoft Corporation |
| .SP4 | Solutions Etcetera | Ficheiros Compactados | SuperCard 4 Player Project | Solutions Etcetera SuperCard | Solutions Etcetera |
| .SPL | Microsoft Corporation | Ficheiros Compactados | Windows Print Spool File | Microsoft Windows | Microsoft Corporation |
| .SPT | Interactive Data Visualization, Inc. | Ficheiros Compactados | SpeedTree Tree Data File | SpeedTree Architect | Interactive Data Visualization, Inc. |
| .SQX | Sven Ritter | Ficheiros Compactados | SQX Archive | SQX archiver | Sven Ritter |
| .SSY | Unknown Developer | Ficheiros Compactados | ScreenShare Compressed Data | ScreenShare | Unknown Developer |
| .SXB | Infor | Ficheiros Compactados | SalesLogix VB Form/Script Transfer | Saleslogix | Infor |
| .SY_ | Microsoft Corporation | Ficheiros Compactados | Compressed SYS File | Microsoft Expand | Microsoft Corporation |
| .TAZ | Smith Micro Software | Ficheiros Compactados | Tar Zipped File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TBZ2 | Winrar | Ficheiros Compactados | Tar BZip 2 Compressed File | WinRAR | Eugene Roshal |
| .TCK | BMI | Ficheiros Compactados | BMISuite Compressed Archive | BMISuite | BMI |
| .TCX | Garmin | Ficheiros Compactados | Training Center Database File | Garmin Connect | Garmin |
| .TG | Julian Gabriel Casadesus and Others | Ficheiros Compactados | TuxGuitar Document | TuxGuitar | Julian Gabriel Casadesus and Others |
| .TGD | Planetside Software | Ficheiros Compactados | Terragen Project File | Planetside Software Terragen | Planetside Software |
| .TGZ | Various Developers | Ficheiros Compactados | Gzipped Tar File | 7-Zip | Igor Pavlov |
| .TLZ | The Open Group | Ficheiros Compactados | Unix TLZ Compression Engine File | Unix | AT&T Labs |
| .TOT | LG Electronics | Ficheiros Compactados | LG Firmware Archive File | LG Flash Tool | LG Electronics |
| .TR | Yadabyte | Ficheiros Compactados | TomeRaider 2 eBook File | TomeRaider | Yadabyte |
| .TRS | Interscape | Ficheiros Compactados | WinTrack Railroad Track Text File | WinTrack | Interscape |
| .TSB | 3dMD | Ficheiros Compactados | 3dMD Or 3Q Viewer 3D Image | 3dMD | 3dMD |
| .TXZ | Open Source | Ficheiros Compactados | XZ Compressed Tar Archive | 7-Zip | Igor Pavlov |
| .TX_ | Microsoft Corporation | Ficheiros Compactados | Compressed TXT File | Microsoft Makecab | Microsoft Corporation |
| .TZ | Smith Micro Software | Ficheiros Compactados | Compressed Tar Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TZIP | Navigation Network Co., Ltd. | Ficheiros Compactados | Tzip Archive File | tzip Utility | Navigation Network Co., Ltd. |
| .UAP | Siemens AG | Ficheiros Compactados | SIMATIC WinCC User Archive Export | TIA Portal | Siemens AG |
| .UC2 | Nico De Vries | Ficheiros Compactados | UltraCompressor 2 Archive | AIPNL UltraCompressor 2.3 or UltraExpander | Unknown Developer |
| .UCN | Nico De Vries | Ficheiros Compactados | UltraCompressor II Compressed Archive | UltraCompressor II | Nico De Vries |
| .UMS | Open Source | Ficheiros Compactados | Dragon UnPACKer Version 5 Archive File | Dragon UnPACKer | Open Source |
| .UPX | Open Source | Ficheiros Compactados | Ultimate Packer For eXecutables File | PeaZip | Open Source |
| .UVZ | Unknown Developer | Ficheiros Compactados | DECE ZIP Compressed Data | Unknown Software | Unknown Developer |
| .UZE | SWE von Schleusen | Ficheiros Compactados | UltimateZip Compressed Archive | UltimateZIP | SWE von Schleusen |
| .VCN | The Danfoss Group | Ficheiros Compactados | Vacon NCDrive Package | VACON NCDrive | The Danfoss Group |
| .VEM | Meta Media | Ficheiros Compactados | Meta Media Video E-Mail File | Meta Media Video Player | Meta Media |
| .VIB | Veeam Software | Ficheiros Compactados | Veeam Backup File | Veeam Backup & Replication | Veeam Software |
| .VIP | JKI | Ficheiros Compactados | Virtual Instrument Package | JKI VIPM | JKI |
| .VSA | Symantec Corporation | Ficheiros Compactados | Virtual Software Archive | Wise Package Studio | Symantec Corporation |
| .VSI | Microsoft Corporation | Ficheiros Compactados | Visual Studio Content Installer File | Microsoft Visual Studio | Microsoft Corporation |
| .WA | Open Source | Ficheiros Compactados | Windows Addon Archive | Win Toolkit | Open Source |
| .WAR | Oracle Corporation | Ficheiros Compactados | Java Web Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .WDZ | PC SOFT | Ficheiros Compactados | WDZip Compressed Archive | WinDev | PC SOFT |
| .WFA | Symantec Corporation | Ficheiros Compactados | WinFax Pro Archive File | WinFax | Delrina |
| .WHL | Python Software Foundation | Ficheiros Compactados | Python Wheel Package | Python | Python Software Foundation |
| .WLB | Verity Software House | Ficheiros Compactados | WinList Protocol Bundle | WinList | Verity Software House |
| .WWA | Aignes | Ficheiros Compactados | WebSite-Watcher Archive | WebSite-Watcher | Aignes |
| .XAR | Magix Software GmbH | Ficheiros Compactados | Xara Xtreme Drawing | Xara Designer Pro X | Magix Software GmbH |
| .XCP | Advanced Systems Concepts, Inc. | Ficheiros Compactados | XLNT Script Command | XLNT | Advanced Systems Concepts, Inc. |
| .XCZ | DynaSend | Ficheiros Compactados | BuzzLetter Encrypted Stationery Templates | BuzzLetter | DynaSend |
| .XDELTA | Open Source | Ficheiros Compactados | Xdelta Binary Differential File | xdelta | Open Source |
| .XEZ | X-Genics Limited | Ficheiros Compactados | X-Genics EManager Template Package | X-Genics eManager | X-Genics Limited |
| .XIP | Apple | Ficheiros Compactados | MacOS Signed Archive | Apple Archive Utility | Apple |
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